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Method for preparing high-purity magnesium aluminate spinel precursor

A pure magnesia-aluminum spinel and precursor technology, applied in the field of preparing high-purity magnesia-aluminum spinel precursors, can solve the problems of good particle dispersion, high efficiency, harsh raw material purity, etc., and achieve high purity and avoid pollution. Effect

Inactive Publication Date: 2021-06-01
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing high-purity magnesium-aluminum spinel precursors in order to solve the problems of powder agglomeration, uncontrollable purity, strict requirements on process parameters, and harsh raw material purity in the process of purifying and preparing high-purity magnesium-aluminum spinel in the prior art. In this method, high-purity aluminum and high-purity magnesium are melted and cast into an alloy plate as the anode, the inert material as the cathode, and the acidic solution as the electrolyte, and the electrolytic cell is separated into an anode electrolytic cell and a negative electrolytic cell by a porous membrane, thereby forming an electrolytic cell During electrolysis, an external field is applied to strengthen the shedding of magnesium-aluminum hydroxide powder on the cathode, avoiding concentration polarization of the anode, and high-purity high-purity magnesium-aluminum spinel precursors can be prepared efficiently and cleanly, and the process is regulated by electrochemical parameters. The process can be control, high product purity, controllable particle size, controllable powder uniformity, good particle dispersion and high efficiency

Method used

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  • Method for preparing high-purity magnesium aluminate spinel precursor
  • Method for preparing high-purity magnesium aluminate spinel precursor
  • Method for preparing high-purity magnesium aluminate spinel precursor

Examples

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Embodiment 1

[0045] combine figure 1 As shown, a method for preparing a high-purity magnesium-aluminum spinel precursor in this embodiment, the steps are: select a high-purity aluminum-magnesium alloy as the anode plate 112, and obtain magnesium-aluminum hydroxide through electric-assisted conversion and an external field 300 Precipitate product 121, and then filter, wash and dry the magnesium-aluminum hydroxide precipitated product 121 successively to obtain a high-purity magnesium-aluminum spinel precursor. The specific steps are:

[0046] Step 1, preparation of anode plate 112

[0047] First heat high-purity aluminum and high-purity magnesium with a purity of 99-99.999% to melt, the molar ratio of magnesium to aluminum is in the range of 1:2-1:4, and then cast it into an aluminum-magnesium alloy plate, and the aluminum-magnesium alloy plate The surface is polished and cleaned to obtain the anode plate 112. After drying, it is stored in an inert gas environment for future use; the purp...

Embodiment 2

[0070] The present embodiment is basically the same as Embodiment 1, the difference being that the external field 300 is an ultrasonic field, and an anode ultrasonic transmitter 310 and a cathode ultrasonic transmitter 320 are respectively arranged at the anode electrolyzer 110 and the cathode electrolyzer 120, respectively to the anode electrolyzer 120. 110 and cathode electrolytic cell 120 emit an ultrasonic field; the ultrasonic frequency of the ultrasonic field is 20-3000 kHz, the ultrasonic power is 0-4000 W, and the ultrasonic external field application method in this embodiment is continuous application. The purity, maximum diameter and current efficiency of the electrolytic cell of the magnesium aluminum hydroxide product 121 obtained by electrolysis are recorded in Table 1. It can be seen that the maximum diameter of the obtained ultrapure alumina precursor is further reduced to 0.11 μm compared with Example 1, which may be due to the fact that the ultrasonic field dir...

Embodiment 3

[0072] This example is basically the same as Example 1, except that the electric field is applied intermittently, and the purity, maximum diameter and current efficiency of the electrolytic cell are recorded in Table 1.

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Abstract

The invention discloses a method for preparing a high-purity magnesium aluminate spinel precursor, and belongs to the technical field of high-purity magnesium aluminate spinel preparation. The preparation method comprises the following steps: selecting a high-purity aluminum-magnesium alloy as an anode plate, carrying out electric auxiliary conversion and external field action, filtering anode impurities by using a porous membrane to obtain a magnesium-aluminum hydroxide precipitate, and sequentially conducting filtering, washing and drying on the magnesium-aluminum hydroxide precipitate to obtain a high-purity magnesium-aluminum spinel precursor. The porous membrane can prevent anode impurities from polluting an electrolytic product magnesium-aluminum hydroxide, an external field not only promotes Al<3+> and Mg<2+> to penetrate through the porous membrane and improves the electrolysis rate and efficiency, but also can control the opportunity that the magnesium-aluminum hydroxide falls off from a cathode, prevent the magnesium-aluminum hydroxide from growing and ensure the size uniformity, and control over the particle size of generated magnesium-aluminum spinel precursor powder is achieved. Anode mud generated in the production process can be used for preparing an aluminum-magnesium alloy byproduct, a hydrogen byproduct is generated by a cathode, and the economical efficiency of the technology can be improved.

Description

technical field [0001] The invention relates to the technical field of preparing high-purity magnesium-aluminum spinel, and more specifically, relates to a method for preparing a high-purity magnesium-aluminum spinel precursor. Background technique [0002] Transparent ceramic materials belong to a large category of advanced ceramics. They have excellent high light transmittance, and at the same time have outstanding characteristics such as high strength, high hardness, corrosion resistance, and high temperature resistance of structural ceramics. It has broad application prospects in equipment, detection, exploration and other equipment, and is one of the hotspots of the top materials at the forefront of science and technology in the world. [0003] In order to ensure the transparency of ceramic materials, the primary task is to use high-purity raw materials, which is one of the important reasons why my country currently relies on imports for almost all related materials. O...

Claims

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Application Information

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IPC IPC(8): C25B1/20C25B11/046C25B9/19C25B15/00
CPCC25B1/20C25B11/04C25B15/00
Inventor 李亚琼张立峰
Owner UNIV OF SCI & TECH BEIJING
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